Glutarimide resin

Abstract

A glutarimide resin contains repeating units of formula (1), wherein R 1 and R 2 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms; repeating units of formula (2), wherein R 3 and R 4 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and repeating units of formula (3), wherein R 5 and R 6 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and R 7 is an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or a substituent containing an aromatic ring having 5 to 15 carbon atoms. The glutarimide resin satisfies the following inequality: 3≤M1+M2≤20. M1 is the content (mol %) of the repeating units of the formula (1) and M2 is the content (mol %) of the repeating units of the formula (2).

1 . A glutarimide resin comprising:
 repeating units represented by the following formula (1):   
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms; 
         repeating units represented by the following formula (2): 
       
       
         
           
           
               
               
           
         
         wherein R 3  and R 4  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms; and 
         repeating units represented by the following formula (3): 
       
       
         
           
           
               
               
           
         
         wherein R 5  and R 6  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and IC is an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or a substituent containing an aromatic ring having 5 to 15 carbon atoms, 
         wherein the glutarimide resin satisfies the following inequality (a):
   3≤ M 1+ M 2≤20  (a),
 
 wherein M1 is a content mol % of the repeating units represented by the formula (1) in the glutarimide resin, M2 is a content mol % of the repeating units represented by the formula (2) in the glutarimide resin, M1>0, and M2>0. 
 
       
     
     
         2 . The glutarimide resin according to  claim 1 , wherein a glass transition temperature of the glutarimide resin is 120° C. or higher. 
     
     
         3 . The glutarimide resin according to  claim 1 , wherein a 5% weight loss temperature in TGA measurement of the glutarimide resin is 350° C. or higher. 
     
     
         4 . The glutarimide resin according to  claim 1 , wherein an orientation birefringence of the glutarimide resin is from −0.01×10 −3  to 2.0×10 −3 . 
     
     
         5 . A glutarimide resin composition comprising the glutarimide resin according to  claim 1 . 
     
     
         6 . An optical film comprising the glutarimide resin composition according to  claim 5 . 
     
     
         7 . The optical film according to  claim 6 , wherein
 an in-plane retardation Re of the optical film at a wavelength of 590 nm is 10 nm or less, and   an absolute value of an out-of-plane retardation Rth of the optical film at a wavelength of 590 nm is 40 nm or less.   
     
     
         8 . A polarizer protective film comprising the optical film according to  claim 6 . 
     
     
         9 . A substrate comprising the glutarimide resin composition according to  claim 5 . 
     
     
         10 . A method for producing a glutarimide resin, the method comprising reacting a raw material resin with ammonia, wherein the raw material resin has a content of acrylic ester monomer units of less than 1 wt % and comprises repeating units represented by the following formula (3): 
       
         
           
           
               
               
           
         
         wherein R 5  and R 6  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and R 7  is an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or a substituent containing an aromatic ring having 5 to 15 carbon atoms.